CN114281013A - High-precision fan shaft vibration protection control device and method thereof - Google Patents
High-precision fan shaft vibration protection control device and method thereof Download PDFInfo
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Abstract
The invention discloses a high-precision fan shaft vibration protection control device and a method thereof, which are matched with a fan and a unit bearing for installation. The safe operation of the unit is ensured, and the reliability of the equipment is improved. The method and the device have the advantages of simple structure, simple and convenient implementation, stable and reliable work, capability of effectively preventing false protection actions of fan shaft vibration, reduction of meaningless shutdown of the fan and improvement of production efficiency.
Description
Technical Field
The invention relates to the technical field of protection of fan equipment, mainly relates to improvement of fault detection accuracy of a fan, and particularly relates to a high-accuracy fan shaft vibration protection control device.
Background
A bearing vibration control device of a blast furnace blower takes single-measuring-point vibration of a unit bearing as interlocking shutdown protection, the fan bearing vibration measuring device comprises a vibration measuring component sensor, an extension cable, a preamplifier, a vibration monitoring device and the like, absolute reliability of the vibration measuring component sensor, the extension cable, the preamplifier, the vibration monitoring device and the like cannot be ensured in the actual operation process of the unit, when a 90-degree double-vibration measuring device is adopted for a pair of supporting bearings of a rotary mechanical device 1, a single-measuring-point vibration value suddenly and greatly rises, the vibration values of other vibration measuring points cannot be kept unchanged, if the vibration values are generated, the vibration interlocking protection action shutdown program of a fan, a gear box and a synchronous motor shaft only can be caused by hardware faults of the measuring device, and the shutdown accident caused by the hardware faults of the fan vibration measuring device is avoided, causing great loss to production. Therefore, it is necessary to develop a high-precision shaft vibration protection control device and method which have simple structure, simple implementation, stable and reliable work and can effectively prevent the false protection action of the fan shaft vibration from stopping.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the inventor provides a high-precision shaft vibration protection control device and a high-precision shaft vibration protection control method which are simple in structure, stable in work and capable of effectively preventing the fan shaft from vibrating, falsely protecting and acting to stop through research and development design.
Specifically, the invention is realized by the following steps: the utility model provides a high accurate fan shaft vibration protection controlling means, with fan, unit bearing looks adaptation installation, including fan bearing vibration detection device, gear box bearing vibration detection device and synchronous machine bearing vibration detection device to and the protection module of shutting down, wherein: the fan bearing vibration detection device comprises four detection elements, a vibration detection unit and a vibration detection unit, wherein the four detection elements are all arranged in a fan bearing area and respectively detect the amplitudes of two end points on an air inlet side and two end points on an air outlet side; the fan shaft displacement detection element is arranged on the air inlet side of the fan and is used for detecting the axial vibration amplitude of the rotor; the gearbox bearing vibration detection device comprises eight detection elements, wherein the eight detection elements are all arranged in a gearbox bearing area, every four detection elements are respectively arranged in a high-speed shaft area and a low-speed shaft area in a group, and each element is used for respectively carrying out amplitude detection on two points on the side of a gearbox fan and two points on the side of a gearbox motor; the synchronous motor bearing vibration detection device comprises four detection elements which are all arranged in a motor bearing area and respectively detect the amplitudes of two end points of a driving side and two end points of a non-driving side; and the protective shutdown module is connected with each detection element, can be used for carrying out real-time data detection on the detection elements and judging whether to maintain the operation of the fan or perform shutdown processing based on data results.
Furthermore, the device also comprises a bearing temperature sensor which is used for detecting the temperature of the main thrust bearing of the fan and is connected to the protective shutdown module.
In another aspect of the present invention, based on the above apparatus, a high-precision fan shaft vibration protection control method is provided, including the following steps: step S1, respectively installing amplitude detection elements for detecting the air inlet side and the air outlet side of the fan, the fan side and the motor side of the gear box, the driving side and the non-driving side of the synchronous motor in the bearing area of the fan, the high-speed shaft area and the low-speed shaft area of the gear box and the bearing area of the motor, and monitoring the detection data of each point in real time; step S2, grouping detection elements in the same area according to the area, wherein each group of detection elements is at least four, detecting the air inlet side and the air outlet side of a fan, the side of a gear box fan and the side of a motor, and the driving side and the non-driving side of a synchronous motor, each side is provided with two A \ B detection point pairs, and a primary response threshold and a secondary response threshold are set for each detection element; and step S3, the protective shutdown module receives real-time detection data of each detection element for monitoring, when the detection data of one detection element reaches a primary threshold, the detection data of the other detection points in the area where the element is located are immediately checked, and if at least one detection data reaches a secondary response threshold, a fan shutdown program is started.
Further, the method also comprises step s4, when the displacement amplitude of the fan shaft exceeds +/-0.8 mm or-0.8 mm and the temperature of the main thrust bearing of the fan is more than or equal to 92 ℃, the fan stopping program is started.
Furthermore, an air inlet side and an air outlet side in a fan bearing area are respectively provided with two A/B point pairs, the first response threshold value of each point is 115 micrometers, and the second response threshold value of each point is 40 micrometers.
Furthermore, two pairs of points A \ B are arranged on the side of the fan and the side of the motor in the high-speed shaft area of the gearbox, the first response threshold value of each point is 125 micrometers, and the second response threshold value of each point is 20 micrometers.
Furthermore, two pairs of points A \ B are arranged on the side of the fan and the side of the motor in the low-speed shaft area of the gearbox, the first response threshold value of each point is 137 micrometers, and the second response threshold value of each point is 30 micrometers.
Furthermore, a driving side and a non-driving side of the motor bearing are both provided with two A \ B point pairs, and a first response threshold value and a second response threshold value of each point are both 265 micrometers and 40 micrometers.
The working principle of the invention is introduced: the invention adopts a fan bearing vibration detection device, a gear box bearing vibration detection device and a synchronous motor bearing vibration detection device and method, namely when the bearing vibration value at the air inlet side A reaches 115 micrometers, the bearing vibration value at any point of the air inlet side B or the air outlet side A, B reaches 40 micrometers, and the single-point vibration of the fan bearing is compared with the vibration of other bearings. In a similar way, each bearing vibration measuring point takes 4 sudden changes of 2 vibration values, namely, the bearing vibration measuring point judges that the bearing vibration measuring point is really vibrated and then sends out shaft vibration interlocking protection action to stop by an interlocking protection action stopping program, so that the problem of stopping caused by single-point hardware faults of the fan vibration measuring device is effectively isolated. That is, when the bearing vibration value of the air inlet side B point of the I18.1 fan reaches 115 micrometers, the bearing vibration value of any point of the air inlet side A point or the air outlet side A, B point of DB13 reaches 40 micrometers, and then M90.1-protection shutdown signals can be triggered to shutdown (the bearing vibration value of any point of the low-speed shaft fan side A point of the gear box reaches 137 micrometers, the bearing vibration value of any point of the fan side B point or the motor side A, B point reaches 30 micrometers, the bearing vibration value of any point of the high-speed shaft fan side A point of the … gear box reaches 125 micrometers, the bearing vibration value of any point of the fan side B point or the motor side A, B point reaches 20 micrometers, the motor driving side A point of … reaches 265 micrometers, the bearing vibration value of any point of the driving side B point or the non-driving side A, B point of the driving side reaches 40 micrometers …), when the bearing vibration value of the non-driving side B point of the I19.7 motor reaches 265, the non-driving side A point or the driving side A point of the DB16 motor needs, when the bearing vibration value of any point of the point B reaches 40 micrometers, triggering shutdown by an M91.7-protection shutdown signal; similarly, the fan bearing vibrates an air inlet side A point and an air outlet side A, B point; the gearbox bearing vibrates the high-speed shaft fan side A, B point, the motor side A, B point; the bearing of the gear box vibrates a low-speed shaft fan side A, B point and a motor side A, B point; the vibration driving side A, B points of the synchronous motor bearing, 16 bearing vibration monitoring points of the non-driving side A, B points all adopt 4 sudden changes of 2 vibration values to judge, the measured value of the axial displacement of the fan reaches +/-0.8 mm or (-0.8 mm) and the temperature value of the main thrust bearing of the fan is more than or equal to 92 ℃ to perform double-signal linkage tripping, the safe operation of the unit is ensured, the reliability of the equipment is improved, N vibration monitoring points can be extended to control, and the effect of protecting the unit is achieved.
The invention has the beneficial effects that: the invention adopts the fan bearing vibration signal judgment and control arrangement, compares the fan bearing single-point vibration with other bearing vibration, and effectively isolates the shutdown problem caused by the shaft vibration single-point abnormality due to the hardware fault of the vibration measurement component. The safe operation of the unit is ensured, and the reliability of the equipment is improved. The method and the device have the advantages of simple structure, simple and convenient implementation, stable and reliable work, capability of effectively preventing false protection actions of fan shaft vibration, reduction of meaningless shutdown of the fan and improvement of production efficiency.
Drawings
FIG. 1 is a circuit schematic of a prior art preventive control device;
FIG. 2 is a schematic diagram of the structure of FIG. 1;
FIGS. 3, 4 and 5 are schematic diagrams of the circuit of the present invention;
FIG. 6 is a schematic diagram of the structure of FIGS. 3 and 4;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1: the utility model provides a high accurate fan shaft vibration protection controlling means, with fan, unit bearing looks adaptation installation, including fan bearing vibration detection device, gear box bearing vibration detection device and synchronous machine bearing vibration detection device to and the protection module of shutting down, wherein: the fan bearing vibration detection device comprises four detection elements, a vibration detection unit and a vibration detection unit, wherein the four detection elements are all arranged in a fan bearing area and respectively detect the amplitudes of two end points on an air inlet side and two end points on an air outlet side; the fan shaft displacement detection element is arranged on the air inlet side of the fan and is used for detecting the axial vibration amplitude of the rotor; the gearbox bearing vibration detection device comprises eight detection elements, wherein the eight detection elements are all arranged in a gearbox bearing area, every four detection elements are respectively arranged in a high-speed shaft area and a low-speed shaft area in a group, and each element is used for respectively carrying out amplitude detection on two points on the side of a gearbox fan and two points on the side of a gearbox motor; the synchronous motor bearing vibration detection device comprises four detection elements which are all arranged in a motor bearing area and respectively detect the amplitudes of two end points of a driving side and two end points of a non-driving side; and the protective shutdown module is connected with each detection element, can be used for carrying out real-time data detection on the detection elements and judging whether to maintain the operation of the fan or perform shutdown processing based on data results. And the bearing temperature sensor is used for detecting the temperature of the main thrust bearing of the fan and is connected to the protection shutdown module.
When the vibration value of the bearing at the air inlet side A of the fan reaches 115 micrometers, the vibration value of the bearing at any point of the air inlet side B or the air exhaust side A, B reaches 40 micrometers, namely, the vibration value of the bearing at the vibration measuring point adopts 4-2 vibration value mutation;
example 2: as shown in fig. 1 and 2, in the fan bearing vibration protection of the fan vibration protection device and method in the prior art, when any vibration monitoring point on the fan, the gear box and the synchronous motor bearing reaches a vibration protection action value, the fan is stopped, that is, a bearing vibration signal reaching stop value at a point B on an air inlet side of the fan, i.e., I18.1, is sent to an M90.1 protection action for stopping.
As shown in fig. 3 and 4, when the bearing vibration value of the point B on the air inlet side of the fan I18.1 reaches 115 micrometers, the bearing vibration value of any point of the point a on the air inlet side of the fan DB13 or the point A, B on the air outlet side of the fan DB needs to reach 40 micrometers, and the fan bearing vibration value is sent to the M90.1 to perform protection operation and stop. Namely, the shaft vibration interlocking protection action is sent out by the interlocking protection action shutdown program to shut down the machine if the machine is judged to be real vibration. The control device and method relate to a main control switch of a PLC, and are electrically and program controlled.
As shown in FIG. 5, when the measured value of the axial displacement of the DB17.DBDO fan reaches +/-0.8 mm or-0.8 mm, the temperature value of the main thrust bearing of the DB1.DBD266 fan is required to be more than or equal to 92 ℃, and then the main thrust bearing is sent to the M92.1 protection action to stop the fan. Namely, the real shaft displacement is judged and then the shaft displacement interlocking protection action shutdown is sent out by the interlocking protection action shutdown program. The control device and method relate to a main control switch of a PLC, and are electrically and program controlled.
The invention adopts a fan bearing vibration detection device, a gear box bearing vibration detection device and a synchronous motor bearing vibration detection device and method, namely when the bearing vibration value of the point A at the air inlet side of a fan reaches 115 micrometers (a set value for fan shutdown is set by Shaanxi drum power company Limited), the bearing vibration value of any point at the point B at the air inlet side or the point A, B at the air exhaust side reaches 40 micrometers, and similarly, each bearing vibration measuring point adopts a sudden change of 4 to 2 vibration values, namely, the vibration value is judged to be real vibration and then shaft vibration interlocking protection action shutdown is sent out by an interlocking protection action shutdown program, thereby effectively isolating the shutdown problem caused by single-point hardware fault of the fan vibration measurement device. Namely, when the bearing vibration value of the air inlet side B point of the I18.1 fan reaches 115 micrometers, the bearing vibration value of any one of the air inlet side A point of the DB13 or the air exhaust side A, B point reaches 40 micrometers, and the bearing vibration value is sent to the M90.1 protection action to stop the machine, so that the function of protecting the machine set is achieved.
Example 3: the fan shaft vibration interlocking protection action shutdown program is optimized as follows (note: the maximum value is a set unit shutdown set value provided by a manufacturer, and the values of other interlocking points are values which are selected by optimizing a real vibration value during a fan surge test and a vibration value during normal operation).
1. The point A of the air inlet side of the fan reaches 115 micrometers, and the bearing vibration value of any point of the point B of the air inlet side or the point A, B of the air outlet side reaches 40 micrometers;
2. when the vibration value of the bearing at the air inlet side B of the fan reaches 115 micrometers, the vibration value of the bearing at any point of the air inlet side A or the air exhaust side A, B reaches 40 micrometers;
3. the point A of the exhaust side of the fan reaches 115 micrometers, and the bearing vibration value of any point of the point B of the exhaust side or the point A, B of the air inlet side reaches 40 micrometers;
4. the point B on the exhaust side of the fan reaches 115 micrometers, and the bearing vibration value of any point of the point A on the exhaust side or the point A, B on the air inlet side reaches 40 micrometers;
5. the bearing vibration value of the fan side point A of the low-speed shaft of the gear box reaches 137 micrometers, and the bearing vibration value of the fan side point B or any point A, B on the motor side reaches 30 micrometers;
6. the bearing vibration value of the wind turbine side B point of the low-speed shaft of the gear box reaches 137 micrometers, and the bearing vibration value of the wind turbine side A point or any point of the motor side A, B point reaches 30 micrometers;
7. the point A of the low-speed shaft motor side of the gear box reaches 137 microns, and the bearing vibration value of the point B of the motor side or any point A, B of the fan side reaches 30 microns;
8. the point B of the low-speed shaft motor side of the gear box reaches 137 microns, and the bearing vibration value of the point A of the motor side or any point A, B of the fan side reaches 30 microns;
9. the bearing vibration value of the fan side point A of the high-speed shaft of the gearbox reaches 125 micrometers, and the bearing vibration value of any point of the fan side point B or the motor side point A, B reaches 20 micrometers;
10. the bearing vibration value of the B point of the high-speed shaft fan side of the gearbox reaches 125 micrometers, and the bearing vibration value of the A point of the fan side or any point A, B point of the motor side reaches 20 micrometers;
11. the bearing vibration value of the motor side point A of the high-speed shaft of the gear box reaches 125 micrometers, and the bearing vibration value of any one point of the motor side point B or the fan side point A, B reaches 20 micrometers;
12. the point B of the high-speed shaft motor side of the gear box reaches 125 micrometers, and the bearing vibration value of any point of the point A of the motor side or the point A, B of the fan side reaches 20 micrometers;
13. the bearing vibration value of a point A on the driving side of the synchronous motor reaches 265 micrometers, and the bearing vibration value of a point B on the driving side or any point A, B on the non-driving side reaches 40 micrometers;
14. the point B of the driving side of the synchronous motor reaches 265 micrometers, and the bearing vibration value of any point of the point A of the driving side or the point A, B of the non-driving side reaches 40 micrometers;
15. the point A of the non-driving side of the synchronous motor reaches 265 micrometers, and the bearing vibration value of any point of the point A of the non-driving side or the point A, B of the driving side reaches 40 micrometers;
16. the point B of the non-driving side of the synchronous motor reaches 265 micrometers, and the bearing vibration value of any point of the point A of the non-driving side or the point A, B of the driving side reaches 40 micrometers;
17. the fan shaft displacement measurement value reaches +/-0.8 mm or-0.8 mm, and the fan main thrust bearing temperature value is more than or equal to 92 ℃, so that the double-signal linkage tripping machine is manufactured.
Namely, each bearing vibration measuring point takes 4 sudden changes of 2 vibration values, the actual vibration is judged, and then the shaft vibration interlocking protection action is sent out by the interlocking protection action shutdown program to shut down. The fan shaft displacement serial amplitude and the main thrust bearing temperature are in double-signal linkage tripping. The control device and method relate to a main control switch of a PLC, and are electrically and program controlled.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A high-precision fan shaft vibration protection control device is matched and installed with a fan and a unit bearing and is characterized by comprising a fan bearing vibration detection device, a gear box bearing vibration detection device, a synchronous motor bearing vibration detection device and a protection shutdown module,
wherein: the fan bearing vibration detection device comprises four detection elements, a vibration detection unit and a vibration detection unit, wherein the four detection elements are all arranged in a fan bearing area and respectively detect the amplitudes of two end points on an air inlet side and two end points on an air outlet side; and the fan shaft displacement detection element is arranged on the air inlet side of the fan and used for detecting the axial vibration amplitude of the rotor.
The gearbox bearing vibration detection device comprises eight detection elements, wherein the eight detection elements are all arranged in a gearbox bearing area, every four detection elements are respectively arranged in a high-speed shaft area and a low-speed shaft area in a group, and each element is used for respectively carrying out amplitude detection on two points on the side of a gearbox fan and two points on the side of a gearbox motor;
the synchronous motor bearing vibration detection device comprises four detection elements which are all arranged in a motor bearing area and respectively detect the amplitudes of two end points of a driving side and two end points of a non-driving side;
and the protective shutdown module is connected with each detection element, can be used for carrying out real-time data detection on the detection elements and judging whether to maintain the operation of the fan or perform shutdown processing based on data results.
2. The high-precision fan shaft vibration protection and control device of claim 1, further comprising a shaft displacement and bearing temperature sensor for detecting fan shaft displacement chatter amplitude and main thrust bearing temperature and connected to the protection shutdown module.
3. The high-precision fan shaft vibration protection control method is characterized by comprising the following steps of:
step S1 is respectively provided with amplitude detection elements for detecting the air inlet side and the air outlet side of the fan, the fan side and the motor side of the gear box, and the driving side and the non-driving side of the synchronous motor in the fan bearing area, the high-speed shaft area and the low-speed shaft area of the gear box and the motor bearing area, and monitoring the detection data of each point in real time;
step S2, grouping detection elements in the same area according to the area, wherein each group of detection elements is at least four, detecting the air inlet side and the air outlet side of a fan, the side of a gear box fan and the side of a motor, and the driving side and the non-driving side of a synchronous motor, each side is provided with two A \ B detection point pairs, and a primary response threshold and a secondary response threshold are set for each detection element;
and step S3, the protective shutdown module receives real-time detection data of each detection element for monitoring, when the detection data of one detection element reaches a primary threshold, the detection data of the other detection points in the area where the element is located are immediately checked, and if at least one detection data reaches a secondary response threshold, a fan shutdown program is started.
4. The high-precision fan shaft vibration protection control method according to claim 3, further comprising step s4, when the displacement amplitude of the fan shaft exceeds +/-0.8 mm or +/-0.8 mm and the temperature of the main thrust bearing of the fan is greater than or equal to 92 ℃, starting a fan shutdown program.
5. The high-precision fan shaft vibration protection control method according to claim 3, wherein two A \ B point pairs are arranged on each of an air inlet side and an air outlet side in a fan bearing area, a first response threshold value of each point is 115 micrometers, and a second response threshold value of each point is 40 micrometers.
6. The high-precision fan shaft vibration protection control method as claimed in claim 3, wherein two A \ B point pairs are arranged on the fan side and the motor side in the high-speed shaft region of the gearbox, and the first response threshold and the second response threshold of each point are 125 microns and 20 microns respectively.
7. The high-precision fan shaft vibration protection control method according to claim 1, wherein two A \ B point pairs are arranged on the side of the fan and the side of the motor in the low-speed shaft region of the gearbox, and the first response threshold and the second response threshold of each point are 137 micrometers and 30 micrometers respectively.
8. The high-precision fan shaft vibration protection control method according to claim 1, wherein two A \ B point pairs are arranged on the driving side and the non-driving side of the motor bearing, and the first response threshold and the second response threshold of each point are 265 micrometers and 40 micrometers respectively.
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